Swing sieve for polycrystalline silicon
By designing a swing screen in the polysilicon screening equipment, and using the combination of multi-layer inclined screen mesh and bounce balls on the movable rack, the problems of hole blocking and material waste in traditional screening equipment are solved, and efficient screening and cost control are achieved.
Patent Information
- Application Number
- CN202421707528.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-18
AI Technical Summary
When traditional linear vibrating screens screen polysilicon materials with <8mm, there is hole blockage, resulting in the inability to completely screen 3-8mm and 1-3mm products, resulting in unqualified product quality. When expanding the screen size to improve the screening rate, material waste and cost will be increased.
A polysilicon swing screen is designed. By setting up a multi-layer inclined screen on the movable rack and setting a bouncing ball between adjacent screens, the movable rack is driven to shake it by using the swing component, so that the bouncing ball hits the screen and cleans the screen, thereby achieving efficient screening.
It achieves the screening rate requirement without changing the size of the screen mesh hole, avoiding material waste and cost increase, and ensuring product quality compliance.
Smart Images
Figure CN222919054U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a screening device for polysilicon, in particular to a swing sieve for polysilicon. Background Art
[0002] As a high-purity raw material, the amount of impurities in the polysilicon material directly affects the quality of downstream products, such as the conversion efficiency and lifespan of final photovoltaic cells. Currently, in the field of Siemens polysilicon production, the rod-shaped polysilicon obtained after reduction, after being crushed and screened, will obtain different specifications, such as: 8 - 50mm, 3 - 8mm, 1 - 3mm, and <1mm.
[0003] In the actual production process, the undersize product obtained after screening the 8 - 50mm material from the crushed material is the material with a size <8mm. Therefore, the undersize product contains a lot of fine powder and small particle materials. So, after passing the <8mm material through a "traditional linear vibrating screen" again, materials with specifications such as 3 - 8mm, 1 - 3mm, and <1mm can be obtained.
[0004] Currently, due to its screening characteristics, the traditional linear screen has the phenomenon of blocked holes during screening. As a result, after screening the <8mm material, the 3 - 8mm and 1 - 3mm products cannot be screened cleanly. For example, a large amount of <1mm material is contained in the 3 - 8mm material (the current industry standard is that the content of <1mm material in the 3 - 8mm material shall not exceed 0.3%, and the content of <0.5mm material in the 1 - 3mm material shall not exceed 0.5%). Therefore, the production products cannot meet the quality requirements.
[0005] Currently, to avoid the phenomenon of unqualified particle sizes in the produced 3 - 8mm and 1 - 3mm materials, mainly by expanding the size of the screen mesh to meet the requirements of the screening yield. However, although this method ensures the quality of the product, there are serious material waste and cost increase phenomena. For example, among the <8mm materials, the particle size value ranking is: 3 - 8mm > 1 - 3mm > 1mm. Therefore, the above method of increasing the screen hole to improve the screening yield will cause large particle materials to fall into the 1 - 3mm due to the increase in the screen hole, resulting in unnecessary waste. Summary of the Utility Model
[0006] Aiming at the technical problems of serious material waste and cost increase in the method of meeting the screening yield requirements by expanding the screen mesh size, the utility model provides a swing sieve for polysilicon, which has the advantages of meeting the screening yield requirements while avoiding material waste and cost increase.
[0007] The technical solution of the utility model is as follows:
[0008] A swing sieve for polysilicon, including a frame, further including:
[0009] The movable frame is suspended at both ends on the frame;
[0010] The screen mesh, with multiple layers of the screen mesh arranged on the movable frame in a layered manner, there is a spacing between adjacent two layers of the screen mesh, and all the screen meshes are arranged in an inclined shape;
[0011] A number of bouncing balls are distributed within the spacing between adjacent screen meshes;
[0012] The swinging assembly is arranged on the frame and is power-connected to one end of the movable frame;
[0013] Wherein, one end of the screen mesh is the material input end, and the other end is the material output end, and the horizontal height of the material input end is higher than the horizontal height of the material output end.
[0014] Optionally, a number of partition plates are provided at the bottom of each screen mesh, and a number of the bouncing balls are present between adjacent partition plates;
[0015] There is a gap between the bottom of the partition plate and the screen mesh below it, and the size of this gap is smaller than the diameter of the bouncing ball.
[0016] Optionally, the swinging assembly includes:
[0017] The motor is arranged on the frame;
[0018] The eccentric shaft is rotatably arranged on the frame and is power-connected to the output shaft of the motor, and the eccentric shaft is connected to the movable frame.
[0019] Optionally, a pallet is provided below each screen mesh, and the pallet has a number of through holes;
[0020] The bouncing balls are located between the screen mesh and the pallet, and the bottom of the partition plate is connected to the pallet.
[0021] Optionally, the mesh size of the screen mesh decreases successively from top to bottom.
[0022] Optionally, a number of output channels are arranged on the movable frame, each material output end of the screen mesh corresponds to and communicates with an output channel, and one output channel is connected to the bottom of the movable frame;
[0023] A sealing plate is provided at the bottom of the movable frame.
[0024] Optionally, the output channels are of a triangular structure, and the ends of all the output channels far away from the movable frame are distributed in a staggered manner.
[0025] Optionally, a cross beam is provided at each end of the frame, and the two ends of the movable frame are respectively suspended on the two cross beams by a steel wire rope or a chain.
[0026] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0027] Both ends of the movable frame are suspended on the frame, and then the movable frame is driven to swing by a swinging assembly. Since a plurality of sieve meshes are arranged on the movable frame and bouncing balls are arranged between adjacent sieve meshes, when the swinging assembly drives the movable frame to swing, the bouncing balls can hit the sieve meshes, so that the material will bounce up when falling onto the sieve meshes, thereby achieving the purpose of cleaning the sieve meshes.
[0028] In this technical solution, the sieve throwing rate requirement is met by cleaning the sieve meshes, and at the same time, the size of the sieve mesh holes remains unchanged, so that material waste and cost increase can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0030] Figure 1 It is a front structural schematic diagram of the present utility model;
[0031] Figure 2 It is a top view of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0032] In the following text, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present utility model. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.
[0033] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present utility model is usually placed, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.
[0034] The following disclosure provides many different embodiments or examples for implementing different structures of the present utility model. To simplify the disclosure of the present utility model, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present utility model. In addition, the present utility model may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present utility model provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.
[0035] The embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.
[0036] Embodiment:
[0037] Refer to Figure 1 and Figure 2 , a swing sieve for polysilicon, comprising a frame 1, a movable frame 2, a screen 3, bouncing balls 4 and a swing assembly 5. Specifically, the movable frame 2 is arranged on the frame 1 and is located in the middle of the frame 1. The movable frame 2 is connected to the frame 1 in a suspended manner, so that the movable frame 2 can swing freely on the frame 1.
[0038] Preferably, a cross beam is provided at each end of the frame 1, and the two ends of the movable frame 2 are respectively suspended on the two cross beams by a steel rope or a chain.
[0039] A plurality of screens 3 are provided on the movable frame 2. All the screens 3 are distributed in layers on the movable frame 2, and there is a spacing between two adjacent screens 3. At the same time, all the screens 3 are arranged obliquely on the movable frame 2. One end of the screen 3 is provided with a material input end, and the other end of the screen 3 is provided with a material output end. The horizontal height of the material input end is the same as that of the material output end, so that the material can tend to move towards the material output end on the screen 3.
[0040] Preferably, the mesh size of the screen 3 decreases successively from top to bottom.
[0041] A number of bouncing balls 4 are arranged between two adjacent screens 3, and the bouncing balls 4 are in a state of being able to move freely between the screens 3.
[0042] The swing assembly 5 is arranged on the frame 1, and the swing end of the swing assembly 5 is connected to the movable frame 2 and is used to drive the movable frame 2 to make a swing similar to an elliptical trajectory.
[0043] In this embodiment, both ends of the movable frame 2 are suspended on the frame 1, and then the movable frame 2 is driven to swing by the swinging assembly 5. Since a plurality of sieve meshes 3 are arranged on the movable frame 2 and bouncing balls 4 are arranged between adjacent sieve meshes 3, when the swinging assembly 5 drives the movable frame 2 to swing, the bouncing balls 4 can impact the sieve meshes 3, so that the material will bounce up when it falls onto the sieve meshes 3, thereby achieving the purpose of cleaning the sieve meshes 3.
[0044] With this technical solution, the sieve throwing rate requirement is met by cleaning the sieve meshes 3. At the same time, the mesh size of the sieve meshes 3 remains unchanged, so material waste and cost increase can be avoided.
[0045] In one specific embodiment:
[0046] A plurality of partition plates 6 are provided at the bottom of each sieve mesh 3. The length direction of the partition plates 6 is perpendicular to the inclination direction of the sieve mesh 3, and the plate surface of the partition plates 6 is perpendicular to the mesh surface of the sieve mesh 3. In addition, there is a gap between the bottom of the partition plates 6 and the sieve mesh 3 below it.
[0047] A plurality of bouncing balls 4 are arranged between every two adjacent partition plates 6. Among them, the diameter of the bouncing balls 4 is greater than the distance between the partition plates 6 and the sieve mesh 3 below them.
[0048] In this embodiment, by arranging the partition plates 6 below the sieve mesh 3 to separate the bouncing balls 4, all the bouncing balls 4 are prevented from converging at the same place inside the sieve mesh 3 in turn, so that the mesh surface of the sieve mesh 3 is fully impacted by the bouncing balls 4.
[0049] In another specific embodiment:
[0050] The swinging assembly 5 includes a motor and an eccentric shaft. The motor is fixedly arranged on the frame 1. One end of the eccentric shaft is rotatably connected to the frame 1, and the other end of the eccentric shaft is rotatably connected to the middle of one end of the movable frame 2. In this embodiment, the eccentric shaft can be a Z-shaped structure.
[0051] The eccentric shaft is power-connected to the output shaft of the motor. This connection method can be belt pulley connection or gear connection, and the connection part between the motor and the eccentric shaft is located at the end where the eccentric shaft is connected to the frame 1.
[0052] In this embodiment, the motor drives the eccentric shaft to rotate, and thus drives the movable frame 2 to swing through the eccentric shaft.
[0053] In another specific embodiment:
[0054] A support plate is arranged below each sieve mesh 3. The support plate has a plurality of through holes. At the same time, the bouncing balls 4 in each layer are located between the support plate and the sieve mesh 3. When the swinging assembly 5 is not working, the bouncing balls 4 are located on the support plate. The bottom of the above-mentioned partition plates 6 is fixedly arranged on the support plate.
[0055] In this embodiment, by providing a supporting plate to lift the bouncing ball 4, the double-sided impact on the sieve mesh 3 during the bouncing of the bouncing ball 4 is avoided, thereby increasing the service life of the sieve mesh 3.
[0056] In another specific embodiment:
[0057] There are multiple output channels provided on the movable frame 2. Each material output end of the sieve mesh 3 is correspondingly connected to an output channel. There is an output channel connected to the bottom of the movable frame 2. Among them, a sealing plate is provided at the bottom of the movable frame 2.
[0058] The output channels are in a triangular structure, and the ends of all output channels away from the movable frame 2 are distributed in a staggered manner.
[0059] In this embodiment, after the powder screening by the sieve mesh 3, the screened material is discharged from the output channels and collected. The ends of the output channels away from the movable frame 2 are arranged in a staggered manner, and the purpose is to reasonably install collection equipment such as a collection bag.
[0060] The above-described embodiments only represent the specific implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.
Claims
1. A polysilicon swing screen, comprising a frame, characterized in that: Also includes: A movable frame, both ends of which are suspended on the frame; A screen, comprising a plurality of screens arranged in layers on the movable frame, with a spacing between two adjacent layers of the screens, and all the screens arranged in an inclined state; A number of bouncing balls are distributed in the intervals between adjacent screens; A swing assembly is disposed on the frame and is dynamically connected to one end of the movable frame; Among them, one end of the screen is the material input end, and the other end is the material output end, and the horizontal height of the material input end is higher than the horizontal height of the material output end.
2. The polysilicon swing screen according to claim 1, characterized in that: A plurality of partitions are provided at the bottom of each screen, and a plurality of bouncing balls are provided between adjacent partitions; There is a gap between the bottom of the partition and the screen below it, and the size of the gap is smaller than the diameter of the bouncing ball.
3. The polysilicon swing screen according to claim 2, characterized in that: The swing assembly comprises: A motor, arranged on the frame; An eccentric shaft is rotatably arranged on the frame and is dynamically connected to the output shaft of the motor. The eccentric shaft is connected to the movable frame.
4. The polysilicon swing screen according to claim 2, characterized in that A support plate is provided under each of the screens, and the support plate has a plurality of through holes; The bouncing ball is located between the screen and the supporting plate, and the bottom of the partition is connected to the supporting plate.
5. The polysilicon swing screen according to claim 2, characterized in that: The mesh sizes of the screen decrease from top to bottom.
6. The polysilicon swing screen according to claim 2, characterized in that: There are multiple output channels arranged on the movable frame, each of the screen material output ends is connected to an output channel, and there is an output channel connected to the bottom of the movable frame; A sealing plate is provided at the bottom of the movable frame.
7. The polysilicon swing screen according to claim 6, characterized in that: The output channels are triangular in structure, and all the output channels are staggered with respect to one end away from the movable frame.
8. The polysilicon swing screen according to claim 2, characterized in that: Two ends of the frame are respectively provided with a cross beam, and two ends of the movable frame are respectively suspended on the two cross beams through a steel rope or a chain.